Okta → Microsoft Entra ID — B2B / partner identity migration playbook
Migrate B2B partner + customer identity from Okta into Entra External ID — typically driven by M365 consolidation or Entra External ID licensing economics.
TL;DR
Okta B2B / Customer Identity → Entra External ID is a partial-scope variant of the full Okta → Entra workforce migration. Specifically targets partner / customer-facing identity flows. Typically 4-8 months for mid-market B2B SaaS.
Okta B2B (Customer Identity / External users)
Microsoft Entra External ID
Typical timeline
4-8 months
Why teams move
- Microsoft External ID licensing more favorable at scale
- Consolidating customer identity into the same Entra ecosystem
- Conditional Access for B2B + partner access
- Migration after Okta CIC pricing tier change
The migration in 4 phases.
1. Phase 1 — Discovery
4-6 weeks
- Inventory B2B applications
- Map partner organizations
- External ID tenant design
2. Phase 2 — External ID setup
4-6 weeks
- External ID tenant configured
- Custom user flows + branding
- Federation policies
3. Phase 3 — Application migration (cohorts)
2-4 months
- Apps re-federated
- B2B invitation flows live
4. Phase 4 — Decommission Okta B2B
1-2 months
- Okta B2B tenant retired
What lives where.
| Capability | Source (Okta) | Target (Microsoft) |
|---|---|---|
| B2B identity tenant | Okta B2B | Entra External ID |
| Partner invitations | Okta B2B invite flow | Entra B2B invitation |
| Identity federation | Okta hub-spoke | Entra cross-tenant access settings |
| Custom flows | Okta sign-in widget | Entra custom user flows |
What moves, what doesn’t.
Partner identities
Don't direct-migrate. Re-invite partners via Entra B2B with same email; users authenticate against their existing IdP.
Custom branding
Recreate in Entra External ID custom user flows. Different framework than Okta widget; rebuild not migrate.
The 7-step cutover.
- 01Cohort-based: partners organized by category (vendor / customer / consultant)
- 02Coexistence window — both tenants accept tokens
- 03Re-invitation campaign with comms
- 04Old Okta B2B decommissioned
What teams find out the hard way.
Partner re-onboarding friction
Partners must re-authenticate / accept new terms on Entra. Plan for support volume during cutover.
Custom claim mapping
Okta custom claims don't round-trip. Recreate them as Entra optional claims or custom attributes.
Questions we get on this migration.
Is this different from Auth0 → External ID?
Yes. Okta B2B is a specific Okta tenant flavor; this is migrating that workload. Auth0 → External ID is a different Okta SKU.
We’ve led this migration. More than once.
Engagement starts with a 90-minute discovery call — we tell you what we’d actually do, with timeline + risk register. No commitment.